EP0092229A2 - Mit Flüssigkeitströpfchen arbeitendes Schreibgerät - Google Patents
Mit Flüssigkeitströpfchen arbeitendes Schreibgerät Download PDFInfo
- Publication number
- EP0092229A2 EP0092229A2 EP83103774A EP83103774A EP0092229A2 EP 0092229 A2 EP0092229 A2 EP 0092229A2 EP 83103774 A EP83103774 A EP 83103774A EP 83103774 A EP83103774 A EP 83103774A EP 0092229 A2 EP0092229 A2 EP 0092229A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- writing
- nozzle
- layer
- nozzles
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/16—Production of nozzles
- B41J2/1606—Coating the nozzle area or the ink chamber
Definitions
- the invention relates to a writing instrument working with liquid droplets, for writing to have at least one nozzle arranged in a carrier, from which writing liquid is ejected if necessary and applied to a recording medium arranged in front of the outlet opening of the nozzle.
- Such a writing instrument is known from DE-OS 25 27 647.
- a certain vacuum can be generated by a suction device in the writing fluid system.
- the underpressure diminishes, so that writing fluid can seep out again.
- Another way of dripping out the Write-Lst 1 TT to prevent liquid from the nozzles is lower attaching üsenlic D to the liquid container in proportion, so that a negative pressure is obtained in the fluid system.
- the writing fluid in the system is sucked back into the container. A certain time delay cannot be avoided when the device is switched on, since the writing liquid must be transported from the container to the nozzles before writing can take place.
- the invention has for its object to provide a writing instrument of the type mentioned, in which a writing fluid does not seep out of the nozzle, so that the side of the nozzle carrier facing the recording medium remains dry.
- this object is achieved in that the side of the nozzle carrier facing the recording medium is provided with a layer whose surface tension is lower than the surface tension of the writing fluid.
- the liquid-repellent layer retains the writing liquid so that it does not seep out of the nozzle. Furthermore, no paper dust adheres to the carrier, so that a well-defined direction of the drops and thus a high writing quality is now achieved.
- the layer according to the invention also does not need to generate a vacuum in the liquid system.
- the layer in the area of the outlet opening of the nozzles is beveled. It is thereby achieved that the nozzles are filled with scraping liquid, which is not the case if the layer is placed into the nozzle. If the nozzle is not completely filled with writing fluid is full, the writing quality drops or the writing can be left out entirely.
- the recording medium 3 for example normal registration paper, is pulled past the side 6 of the housing 7 in the direction of the arrow 4 by means of a spacer 5 via the transport rollers 1 and 2.
- the connecting line 8 is guided, which is provided at its free end with a plug 9 for connection to a control device, not shown, which supplies the control signals for recording the desired courses, characters or images.
- Fig. 3 it is shown how the side 6 is attached parallel to the record carrier.
- the side 6 is the side of a carrier 10 which has a number of nozzles 11 arranged side by side in a row.
- rods or transducers 12 made of piezoelectric material in the housing, which are contacted and arranged in such a way that they spray writing liquid in the form of a droplet from the nozzle 11 with appropriate electrical control.
- FIG. 4 shows that the transducers 12, which are designed as teeth of a comb, work as bending vibrators.
- the piezo comb consisting of the transducer 12 and the comb back 13 is arranged parallel to the plane of the carrier 10.
- the free end area of the individual transducers 12 is located in front of the individual nozzles 11 of the row of nozzles.
- the comb back 13 is screwed with a fastening screw set 14 onto the carrier 10 receiving the row of nozzles.
- the side 6 is provided with a layer 15, the surface tension of which is lower than the surface tension of the writing liquid.
- Materials of this type are e.g. 3. Polyethylene or polytetrafluoroethylene.
- the layer has a thickness of 0.1 ⁇ m. to 10 ⁇ m, preferably 1 ⁇ m.
- the layer is chamfered in the area 6 of the outlet opening of the nozzles 11 so that the nozzles 11 are completely filled with writing fluid.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Pens And Brushes (AREA)
Abstract
Bei einem mit Flüssigkeitströpfchen arbeitenden Schreibgerät, bei dem zum Schreiben mindestens eine in einem Träger angeordnete Düse vorhanden ist, kann bei Bedarf Schreibflüssigkeit aus der Düse auf einen vor deren Austrittsöffnung angeordneten Aufzeichnungsträger aufgebracht werden. Um zu vermeiden, daß ungewünschtes Heraussickern von Schreibflüssigkeit aus der Düse erfolgt und damit zu verhindern, daß ein Belag von Flüssigkeit und Papierstaub die Austrittsöffnung der Düsen verstopft, ist erfindungsgemäß vorgesehen, daß die dem Aufzeichnungsträger (3) zugewandte Seite (6) des Düsenträgers (10) mit einer Schicht (15) versehen ist, deren Oberflächenspannung niedriger als die Oberflächenspannung der Schreibflüssigkeit ist.
Description
- Die Erfindung betrifft ein mit Flüssigkeitströpfchen arbeitendes Schreibgerät, wobei zum Schreiben mindestens eine in einem Träger angeordnete Düse vorhanden ist, aus der bei Bedarf Schreibflüssigkeit herausgestossen und auf einen vor der Austrittsöffnung der Düse angeordneten Aufzeichnungsträger aufgebracht wird.
- Ein solches Schreibgerät ist durch die DE-OS 25 27 647 bekannt. Bei Schreibgeräten dieser Art passiert es häufig, dass die dem Aufzeichnungsträger zugewandte Seite des Düsenträgers, insbesondere um die Düsen herum, durch Schreibflüssigkeit, die aus den Düsen heraussikkert, benetzt wird. Dies hat den Nachteil, dass Papierstaub vom Aufzeichnungspapier auf der Oberfläche des Düsenträgers haftet und zusammen mit der SchreibElüssigkeit einen Belag bildet, der die Schreibfunktion verschlechtert. So kann z. B. der Belag einen Teil der Düsenmündung verstopfen, so dass die Richtung der herausgestossenen Tropfen beeinflusst wird.
- Um zu vermeiden, dass Schreibflüssigkeit aus den Düsen heraussickert, kann z. B. durch eine Saugvorrichtung in dem Schreibflüssigkeitssystem ein bestimmter Unterdruck erzeugt werden. Beim Ausschalten des Schreibgerätes lässt der UnterdrucK jedoch nach, so dass wieder Schreibflüssigkeit heraussickern kann.
- Eine weitere Möglichkeit, das Heraustropfen der Schreib-Lst 1 TT flüssigkeit aus den Düsen zu verhindern,ist, den Flüssigkeitsbehälter im Verhältnis zum Düsenträger niedriger anzubringen, so dass ein Unterdruck im Flüssigkeitssystem erhalten wird. Beim Ausschalten des Gerätes wird die im System vorhandene Schreibflüssigkeit in den Behälter zurückgesaugt. Beim Einschalten des Gerätes ist eine gewisse Zeitverzögerung nicht zu vermeiden, da die Schreibflüssigkeit vom Behälter zu den Düsen transportiert werden muss, bevor geschrieben werden kann.
- Der Erfindung liegt die Aufgabe zugrunde, ein Schreibgerät der eingangs genannten Art zu schaffen, bei dem ein Heraussickern von Schreibflüssigkeit aus der Düse nicht erfolgt, so dass die dem Aufzeichnungsträger zugewandte Seite des. Düsenträgers trocken bleibt.
- Diese Aufgabe ist erfindungsgemäss dadurch gelöst, dass die dem Aufzeichnungsträger zugewandte Seite des Düsenträgers mit einer Schicht versehen ist, deren Oberflächenspannung niedriger als die Oberflächenspannung der Schreibflüssigkeit ist. Die flüssigkeitsabstossende Schicht hält die Schreibflüssigkeit zurück, so dass sie nicht aus der Düse heraussickert. Ferner bleibt kein Papierstaub am Träger haften, so dass nunmehr eine gut definierte Richtung der Tropfen und damit eine hohe Schreibqualität erreicht ist. Durch die erfindungsgemässe Schicht braucht auch kein Unterdruck im Flüssigkeitssystem erzeugt zu werden.
- In einer Weiterbildung der Erfindung wird vorgeschlagen, dass die Schicht im Bereich der Austrittsöffnung der Düsen abgeschrägt ist. Dadurch ist erreicht, dass die Düsen mit Schraibflüssigkeit gefüllt sind, was nicht der Fall ist, wenn die Schicht bis in die Düse gelegt wird. Wenn die Düse nicht ganz mit Schreibflüssigkeit gefüllt ist, sinkt die Schreibqualität bzw. die Schrift kann ganz ausbleiben.
- Die Erfindung ist nachfolgend anhand eines in den Zeichnungen dargestellten Ausführungsbeispieles näher erläutert. Es zeigen:
- Fig. 1 einen Schnitt durch einen erfindungsgemässen Düsenträger gemäss Schnittlinie I-I von Fig. 4,
- Fig. 2 eine schematische Ansicht eines Schreibgerätes,
- Fig. 3 eine Seitenansicht eines als Biegeschwinger arbeitenden piezoelektrischen Wandlers, und
- Fig. 4 eine Draufsicht auf den Düsenträger nach Fig. 1 mit einer kammartig ausgebildeten piezoelektrischen Wandleranordnung.
- Aus Fig. 2 ist der äussere Prinzipaufbau eines bekannten Schreibgerätes ersichtlich. Über die Transportrollen 1 und 2 wird der Aufzeichnungsträger 3, z: B. normales Registrierpapier, in Richtung des Pfeiles 4 über einen Abstandhalter 5 an der Seite 6 des Gehäuses 7 vorbeigezogen. In das Gehäuse 7 ist die Anschlussleitung 8 geführt, die an ihrem freien Ende mit einem Stekker 9 zum Anschluss an ein nicht dargestelltes Steuergerät versehen ist, das die Steuersignale für die Aufzeichnung der gewünschten Verläufe, Zeichen oder Bilder liefert.
- In Fig. 3 ist dargestellt, wie die Seite 6 parallel zum Aufzeichnungsträger angebracht ist. Die Seite 6 ist die Seite eines Trägers 10, der eine Anzahl in einer Reihe nebeneinander angeordnete Düsen 11 aufweist. Ausser der Schreibflüssigkeit sind im Gehäuse 7 Stäbe oder Wandler 12 aus piezoelektrischem Material vorhanden, die derart kontaktiert und angeordnet sind, dass sie bei entsprechender elektrischer Ansteuerung Schreibflüssigkeit in Form eines Tröpfchens aus der Düse 11 spritzen.
- In Fig. 4 ist dargestellt, dass die Wandler 12, die als Zähne eines Kammes ausgebildet sind, als Biegeschwinger arbeiten. Dabei ist der aus dem Wandler 12 und dem Kammrücken 13 bestehende Piezokamm parallel zur Ebene des Trägers 10 angeordnet. Der freie Endbereich der einzelnen Wandler 12 befindet sich vor den einzelnen Düsen 11 der Düsenreihe. Der Kammrücken 13 ist mit einem Befestigungsschraubsatz 14 auf dem die Düsenreihe aufnehmenden Träger 10 angeschraubt. Bei Anlegen von elektrischer Spannung an die Kontaktierungen eines Wandlers 12 bewegt sich dieser in die in Fig. 3 gestrichelt dargestellte Position. Bei einer Unterbrechung der angelegten Spannung schnellt er zurück in die nicht gebogene, mit durchgezogenen Linien gezeichnete Stellung und drückt dabei ein Tröpfchen Schreibflüssigkeit durch die Düse 11.
- In Fig. 1 ist dargestellt, dass die Seite 6 mit einer Schicht 15 versehen ist, deren Oberflächenspannung niedriger als die Oberflächenspannung der Schreibflüssigkeit ist. Materiale dieser Art sind z. 3. Polyäthylen oder Polytetraflouräthylen. Die Schicht weist eine Stärke von 0,1 um. bis 10 µm vorzugsweise 1 um auf. Die Schicht ist im Bereich 6 der Austrittsöffnung der Düsen 11 abgeschrägt, damit die Düsen 11 ganz mit Schreibflüssigkeit gefüllt werden.
- Wegen der niedrigeren Oberflächenspannung der Schicht 15 sickert keine Schreibflüssigkeit durch die Düsen 11, wodurch die Seite 6 trocken bleibt.
Claims (6)
1. Mit Flüssigkeitströpfchen arbeitendes Schreibgerät, bei dem zum Schreiben mindestens eine in einem Träger angeordnete Düse vorhanden ist, aus der bei Bedarf Schreibflüssigkeit herausgestossen und auf einen vor der Austrittsöffnung der Düse angeordneten Aufzeichnungsträger aufgebracht wird, dadurch gekennzeichnet, dass die dem Aufzeichnungsträger (3) zugewandte Seite (6) des Düsenträgers (10) mit einer Schicht (15) versehen ist, deren Oberflächenspannung niedriger als die Oberflächenspannung der Schreibflüssigkeit ist.
2. Schreibgerät nach Anspruch 1, dadurch gekennzeichnet, dass die Schicht (15) aus Polyäthylen besteht.
3. Schreibgerät nach Anspruch 1. dadurch gekennzeichnet, dass die Schicht (15) aus Polytetrafluoräthylen besteht.
4. Schreibgerät nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet , dass die Schicht (15) eine Stärke von 0,1 µm bis 10 µm, vorzugsweise 1 µm aufweist.
5. Schreibgerät nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet , dass die Schicht (15) im Bereich (15) der Austrittsöffnung der Düse bzw. Düsen abgeschrägt ist.
6. Verwendung eines mit FLUssigKeitströpfchen arbeitenden Schreibgerätes nach einem der Ansprüche 1 bis 5 zur punktweisen Aufzeichnung analoger Verläufe oder alphanumerischer Zeichen sowie von Bildern, wobei zum Schreiben der einzelnen Punkte reihenweise in einem gemeinsamen Träger angeordnete Düsen vorhanden sind, vor deren Eintrittsöffnungen derart kontaktierte piezoelektrische Wandler angeordnet sind, dass bei elektrischen Spannungsänderungen an der Kontaktierung Schreibflüssigkeit aus der Düse herausgestossen und auf einen vor der Austrittsöffnung der Düsen angeordneten Aufzeichnungsträger aufgebracht wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19823214791 DE3214791A1 (de) | 1982-04-21 | 1982-04-21 | Mit fluessigkeitstroepfchen arbeitendes schreibgeraet |
DE3214791 | 1982-04-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0092229A2 true EP0092229A2 (de) | 1983-10-26 |
EP0092229A3 EP0092229A3 (en) | 1985-04-10 |
Family
ID=6161522
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83103774A Withdrawn EP0092229A3 (en) | 1982-04-21 | 1983-04-19 | Liquid droplets recording device |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0092229A3 (de) |
JP (1) | JPS58191171A (de) |
DE (1) | DE3214791A1 (de) |
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US5208606A (en) * | 1991-11-21 | 1993-05-04 | Xerox Corporation | Directionality of thermal ink jet transducers by front face metalization |
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Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4100730C2 (de) * | 1991-01-09 | 1997-04-03 | Francotyp Postalia Gmbh | Verfahren für eine Flüssigkeitsstrahl-Druckvorrichtung |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2527079A1 (de) * | 1975-06-18 | 1976-12-23 | Olympia Werke Ag | Oeffnungen fluessigkeitsleitender hohlraeume und verfahren zur gestaltung des oeffnungsbereiches |
JPS55148170A (en) * | 1979-05-07 | 1980-11-18 | Canon Inc | Recording head |
DE3047835A1 (de) * | 1979-12-19 | 1981-09-17 | Canon K.K., Tokyo | Tintenstrahl-aufzeichnungskopf |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2527647C3 (de) * | 1975-06-20 | 1981-06-25 | Siemens AG, 1000 Berlin und 8000 München | Mit Flüssigkeitströpfchen arbeitendes Schreibgerät |
JPS5621862A (en) * | 1979-07-30 | 1981-02-28 | Nec Corp | Ink jet head and method of its manufacturing |
JPS5684659A (en) * | 1979-12-13 | 1981-07-10 | Ricoh Co Ltd | Liquid injection head |
JPS56113466A (en) * | 1980-02-12 | 1981-09-07 | Ricoh Co Ltd | Head for ink jet recording |
JPS5729465A (en) * | 1980-07-31 | 1982-02-17 | Toshiba Corp | Ink jet recording head |
-
1982
- 1982-04-21 DE DE19823214791 patent/DE3214791A1/de not_active Withdrawn
-
1983
- 1983-04-19 EP EP83103774A patent/EP0092229A3/de not_active Withdrawn
- 1983-04-19 JP JP6908683A patent/JPS58191171A/ja active Pending
Patent Citations (3)
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Also Published As
Publication number | Publication date |
---|---|
EP0092229A3 (en) | 1985-04-10 |
DE3214791A1 (de) | 1983-10-27 |
JPS58191171A (ja) | 1983-11-08 |
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